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If L = 2.06 cm pm 0.02 cm , B = 1.11 cm ...

If L = 2.06 cm `pm 0.02 cm , B = 1.11 cm pm 0.03 cm `. What are (L+B) and (L-B) equal to ?

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`L+B= 3.17cm +- 0.05cm`
`L-B= 0.95 cm +- 0.05cm`
Please note that actual values i.e. 2.06 cm and 1.11 cm are added in case of (L+B) and subtracted in case of (L-B), but absolute errors are added in both cases.
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